The wonderful photo below is other parts of restaurant supply bar stools post which is published by erick.

"Nicer" metal bar stools typically have all-welded frames. The only bolts you may see hold the seat to the swivel mechanism and there may be a few screws holding the seat pad to the metal frame. This type of construction is far more sturdy than "RTA" stools,

Fabrics: Both wood and metal bar stools may have countless fabrics to choose from. Look for high quality fabrics that complement your home`s decor as well as a fabric that works well with the finish you have selected AND the style of the bar stool. An "Antique Tapestry" is a beautiful fabric but NOT on a silver modernized frame! Synthetic suede fabrics are very durable and easy to clean. They simulate the look and feel of suede but are far more easy to care for than cotton or other natural coverings. Some manufacturers offer the ability to use your own fabric. These are commonly referred to as "COM" or "Customer`s Own Material." If you choose to use your own fabric make sure it is an upholstery grade fabric and check with your salesperson to see how much material will be needed for each stool. Stools with backs generally require 2 yards per stool whereas backless or metal back stools generally require 1 yard per stool. If your fabric has a repeating pattern that you want to match it may be necessary to provide more fabric so the factory can match the placement of a design from one stool to the other,

Metal or Wood? This is a good question. If you ask 10 retailers you`ll get 10 responses. Due to the soft nature of wood (when compared to steel) screws and joints tend to come loose over time- especially wood with arms.